/* ===== CSS RESET & VARIABLES ===== */
:root {
  /* Dark Theme (Default) */
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary: #10b981;
  --accent: #f59e0b;
  --danger: #ef4444;
  --success: #10b981;
  --warning: #f59e0b;
  --info: #3b82f6;
  
  --dark: #0f172a;
  --dark-light: #1e293b;
  --darker: #020617;
  --light: #f8fafc;
  --gray: #64748b;
  --gray-light: #e2e8f0;
  --gray-dark: #475569;
  
  --card-bg: rgba(30, 41, 59, 0.7);
  --card-border: rgba(255, 255, 255, 0.1);
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.4);
  
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --animation-duration: 0.3s;
}

[data-theme="light"] {
  --dark: #f8fafc;
  --dark-light: #e2e8f0;
  --darker: #ffffff;
  --light: #0f172a;
  --gray: #94a3b8;
  --gray-light: #475569;
  --gray-dark: #334155;
  
  --card-bg: rgba(255, 255, 255, 0.9);
  --card-border: rgba(0, 0, 0, 0.1);
  --glass-bg: rgba(0, 0, 0, 0.05);
  --glass-border: rgba(0, 0, 0, 0.1);
  
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--dark);
  color: var(--light);
  line-height: 1.6;
  min-height: 100vh;
  transition: var(--transition);
  position: relative;
  overflow-x: hidden;
}

/* ===== BACKGROUND ANIMATION ===== */
.background-animation {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  overflow: hidden;
}

.gradient-circle {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.3;
  animation: float 20s infinite alternate ease-in-out;
}

.circle-1 {
  width: 500px;
  height: 500px;
  background: linear-gradient(135deg, var(--primary), #ec4899);
  top: -200px;
  right: -100px;
  animation-delay: 0s;
}

.circle-2 {
  width: 400px;
  height: 400px;
  background: linear-gradient(135deg, var(--secondary), #3b82f6);
  bottom: -150px;
  left: -100px;
  animation-delay: -5s;
  animation-direction: alternate-reverse;
}

.circle-3 {
  width: 300px;
  height: 300px;
  background: linear-gradient(135deg, var(--accent), #8b5cf6);
  top: 50%;
  left: 70%;
  animation-delay: -10s;
}

.particles {
  position: absolute;
  width: 100%;
  height: 100%;
  background-image: 
    radial-gradient(circle at 20% 30%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(16, 185, 129, 0.1) 0%, transparent 50%);
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-30px, -30px) scale(1.1); }
}

/* NAVBAR */
.navbar {
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--card-border);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 20px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo i {
  font-size: 28px;
  color: var(--primary);
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo h1 {
  font-size: 24px;
  font-weight: 700;
}

.logo span {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 25px;
}

.nav-links a {
  color: var(--gray);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
}

.nav-links a:hover {
  color: var(--primary);
  background: rgba(139, 92, 246, 0.1);
}

.theme-toggle {
  display: flex;
  align-items: center;
  background: var(--dark-light);
  border: none;
  padding: 5px;
  border-radius: 50px;
  cursor: pointer;
  position: relative;
  width: 60px;
  height: 30px;
}

.theme-toggle i {
  font-size: 14px;
  color: var(--light);
  z-index: 2;
  position: relative;
  padding: 0 5px;
}

.theme-toggle .toggle-circle {
  position: absolute;
  left: 3px;
  top: 3px;
  width: 24px;
  height: 24px;
  background: var(--primary);
  border-radius: 50%;
  transition: var(--transition);
}

body.light-mode .theme-toggle .toggle-circle {
  left: 33px;
}

.theme-toggle {
  position: relative;
  width: 60px;
  height: 30px;
  background: var(--dark-light);
  border: 2px solid var(--card-border);
  border-radius: 50px;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 0.5rem;
}

.theme-toggle i {
  font-size: 0.875rem;
  color: var(--gray);
  z-index: 2;
  transition: var(--transition);
}

.theme-toggle .toggle-circle {
  position: absolute;
  left: 4px;
  top: 4px;
  width: 22px;
  height: 22px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 50%;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow);
}

[data-theme="light"] .theme-toggle .toggle-circle {
  transform: translateX(30px);
}

.btn-premium {
  background: linear-gradient(135deg, #f59e0b, #fbbf24);
  color: #78350f;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition);
}

.btn-premium:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(245, 158, 11, 0.3);
}

/* ===== MAIN CONTAINER ===== */
.main-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 6rem 2rem 2rem;
  position: relative;
}

/* ===== HERO SECTION ===== */
.hero-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  margin-bottom: 4rem;
  padding: 2rem 0;
}

.hero-content {
  animation: slideInLeft 0.8s ease-out;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(16, 185, 129, 0.1);
  color: var(--secondary);
  padding: 0.5rem 1rem;
  border-radius: 50px;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--light), var(--gray));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  position: relative;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--gray);
  margin-bottom: 2rem;
  max-width: 600px;
  line-height: 1.8;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 2rem;
}

.stat-card {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: var(--transition);
}

.stat-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary);
  box-shadow: var(--shadow);
}

.stat-icon {
  width: 48px;
  height: 48px;
  background: rgba(99, 102, 241, 0.1);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  color: var(--primary);
  font-size: 1.25rem;
}

.stat-content h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.stat-content p {
  font-size: 0.875rem;
  color: var(--gray);
}

.hero-visual {
  animation: slideInRight 0.8s ease-out;
}

.visual-animation {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  position: relative;
}

.image-placeholder {
  width: 180px;
  height: 180px;
  background: var(--card-bg);
  border: 2px solid var(--card-border);
  border-radius: var(--radius-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: var(--transition);
  animation: float 3s infinite ease-in-out;
}

.image-placeholder i {
  font-size: 3rem;
  color: var(--primary);
  margin-bottom: 1rem;
}

.file-size {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--gray);
}

.compressed {
  border-color: var(--secondary);
  background: rgba(16, 185, 129, 0.1);
}

.compressed i {
  color: var(--secondary);
}

.compression-badge {
  position: absolute;
  bottom: -10px;
  background: var(--secondary);
  color: white;
  padding: 0.25rem 1rem;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
  animation: pulse 2s infinite;
}

.arrow-animation {
  color: var(--primary);
  font-size: 2rem;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateX(0); }
  50% { transform: translateX(10px); }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.8; transform: scale(1.05); }
}

/* ===== COMPRESSION SECTION ===== */
.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-header h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

.section-header p {
  color: var(--gray);
  font-size: 1.125rem;
}

.compression-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 2rem;
  margin-bottom: 4rem;
}

.compression-column {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* ===== CARDS ===== */
.card {
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  transition: var(--transition);
}

.card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-xl);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--card-border);
}

.card-header h3 {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  font-weight: 600;
}

.card-subtitle {
  color: var(--gray);
  font-size: 0.875rem;
}

/* ===== UPLOAD AREA ===== */
.upload-container {
  position: relative;
}

.upload-area {
  background: var(--glass-bg);
  border: 3px dashed var(--card-border);
  border-radius: var(--radius-lg);
  padding: 3rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.upload-area:hover, .upload-area.dragover {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.05);
  transform: translateY(-2px);
}

.upload-icon {
  font-size: 3rem;
  color: var(--primary);
  margin-bottom: 1rem;
  animation: pulse 2s infinite;
}

.upload-area h4 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.upload-area p {
  color: var(--gray);
  margin-bottom: 1rem;
}

.file-limits {
  display: inline-block;
  background: rgba(99, 102, 241, 0.1);
  color: var(--primary);
  padding: 0.25rem 1rem;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
  border: 1px solid rgba(99, 102, 241, 0.2);
}

#imageInput {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.upload-features {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--card-border);
}

.feature {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--gray);
}

.feature i {
  color: var(--secondary);
}

.uploaded-files {
  margin-top: 1rem;
  max-height: 200px;
  overflow-y: auto;
}

.file-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: var(--glass-bg);
  border-radius: var(--radius);
  margin-bottom: 0.5rem;
  border: 1px solid var(--card-border);
}

.file-icon {
  width: 40px;
  height: 40px;
  background: rgba(99, 102, 241, 0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
}

.file-info {
  flex: 1;
}

.file-name {
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.file-size {
  font-size: 0.75rem;
  color: var(--gray);
}

.file-actions {
  display: flex;
  gap: 0.5rem;
}

.btn-remove {
  width: 32px;
  height: 32px;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.2);
  border-radius: var(--radius-sm);
  color: var(--danger);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.btn-remove:hover {
  background: rgba(239, 68, 68, 0.2);
}

/* ===== PREVIEW ===== */
.preview-container {
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.empty-preview {
  text-align: center;
  color: var(--gray);
}

.empty-preview i {
  font-size: 4rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.empty-preview h4 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.image-preview-wrapper {
  width: 100%;
}

.image-container {
  position: relative;
  width: 100%;
  height: 300px;
  background: var(--darker);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 1.5rem;
}

.preview-image {
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: transform 0.3s ease;
}

.image-overlay {
  position: absolute;
  bottom: 1rem;
  right: 1rem;
  display: flex;
  gap: 0.5rem;
}

.btn-zoom {
  width: 40px;
  height: 40px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  color: var(--light);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.btn-zoom:hover {
  background: var(--primary);
  color: white;
}

.image-info {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.info-item {
  background: var(--glass-bg);
  padding: 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--card-border);
}

.info-label {
  display: block;
  font-size: 0.75rem;
  color: var(--gray);
  margin-bottom: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.info-value {
  font-weight: 600;
  font-size: 1rem;
}

/* ===== SETTINGS ===== */
.settings-content {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.setting-group {
  background: var(--glass-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.setting-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.setting-header h4 {
  font-size: 1rem;
  font-weight: 600;
}

.value-display {
  background: rgba(99, 102, 241, 0.1);
  color: var(--primary);
  padding: 0.25rem 0.75rem;
  border-radius: 50px;
  font-size: 0.875rem;
  font-weight: 600;
}

.quality-slider {
  margin-bottom: 1rem;
}

.range-slider {
  width: 100%;
  height: 8px;
  -webkit-appearance: none;
  background: linear-gradient(to right, var(--danger), var(--warning), var(--success));
  border-radius: 4px;
  outline: none;
  margin: 1rem 0;
}

.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 24px;
  height: 24px;
  background: white;
  border: 3px solid var(--primary);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  transition: var(--transition);
}

.range-slider::-webkit-slider-thumb:hover {
  transform: scale(1.1);
}

.slider-ticks {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--gray);
  margin-top: 0.5rem;
}

.quality-presets {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
}

.preset-btn {
  background: var(--glass-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 1rem;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.preset-btn:hover, .preset-btn.active {
  background: rgba(99, 102, 241, 0.1);
  border-color: var(--primary);
  transform: translateY(-2px);
}

.preset-label {
  font-size: 0.875rem;
  font-weight: 600;
}

.preset-desc {
  font-size: 0.75rem;
  color: var(--gray);
}

/* ===== RESIZE OPTIONS ===== */
.resize-options {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--card-border);
}

.dimension-inputs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 1rem;
}

.dimension-input {
  position: relative;
}

.dimension-input label {
  display: block;
  font-size: 0.875rem;
  color: var(--gray);
  margin-bottom: 0.5rem;
}

.dimension-input input {
  width: 100%;
  background: var(--dark);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 0.75rem;
  color: var(--light);
  font-size: 1rem;
}

.dimension-unit {
  position: absolute;
  right: 0.75rem;
  top: 2.5rem;
  color: var(--gray);
  font-size: 0.875rem;
}

.aspect-ratio {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.ratio-btn {
  flex: 1;
  background: var(--glass-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 0.75rem;
  color: var(--gray);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.ratio-btn:hover, .ratio-btn.active {
  background: rgba(99, 102, 241, 0.1);
  border-color: var(--primary);
  color: var(--primary);
}

.resize-presets {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.resize-presets span {
  font-size: 0.875rem;
  color: var(--gray);
}

.size-preset {
  background: var(--glass-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 0.5rem 1rem;
  color: var(--gray);
  cursor: pointer;
  transition: var(--transition);
  font-size: 0.875rem;
}

.size-preset:hover {
  background: rgba(99, 102, 241, 0.1);
  border-color: var(--primary);
  color: var(--primary);
}

/* ===== FORMAT OPTIONS ===== */
.format-options {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
}

.format-option {
  background: var(--glass-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 1rem;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  text-align: center;
}

.format-option:hover, .format-option.active {
  background: rgba(99, 102, 241, 0.1);
  border-color: var(--primary);
  transform: translateY(-2px);
}

.format-option i {
  font-size: 1.5rem;
  color: var(--primary);
}

.format-option span {
  font-weight: 600;
  font-size: 0.875rem;
}

.format-option small {
  font-size: 0.75rem;
  color: var(--gray);
}

/* ===== ADVANCED OPTIONS ===== */
.advanced-options {
  background: transparent;
  border: none;
  padding: 0;
}

.advanced-content {
  margin-top: 1rem;
  padding: 1.5rem;
  background: var(--glass-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  display: none;
}

.advanced-content.show {
  display: block;
  animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.advanced-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.advanced-item:last-child {
  margin-bottom: 0;
}

.advanced-item label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 150px;
  font-weight: 500;
}

.advanced-item i {
  color: var(--primary);
}

.advanced-item input[type="range"] {
  flex: 1;
}

.advanced-item input[type="color"] {
  width: 40px;
  height: 40px;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  background: transparent;
}

/* ===== STATISTICS ===== */
.stats-content {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.stat-item {
  background: var(--glass-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  transition: var(--transition);
}

.stat-item:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
}

.stat-icon {
  width: 48px;
  height: 48px;
  background: rgba(99, 102, 241, 0.1);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 1.25rem;
}

.stat-data {
  flex: 1;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  background: linear-gradient(135deg, var(--light), var(--gray));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--gray);
}

.compression-graph {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.graph-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.graph-label {
  min-width: 80px;
  font-size: 0.875rem;
  font-weight: 500;
}

.graph-track {
  flex: 1;
  height: 8px;
  background: var(--glass-bg);
  border-radius: 4px;
  overflow: hidden;
}

.graph-fill {
  height: 100%;
  transition: width 1s ease-in-out;
}

.graph-fill.original {
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
}

.graph-fill.compressed {
  background: linear-gradient(90deg, var(--secondary), #34d399);
}

.graph-value {
  min-width: 60px;
  text-align: right;
  font-weight: 600;
  font-size: 0.875rem;
}

/* ===== ACTION BUTTONS ===== */
.action-buttons {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.btn-primary, .btn-success, .btn-secondary {
  width: 100%;
  padding: 1.25rem;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(99, 102, 241, 0.3);
}

.btn-success {
  background: linear-gradient(135deg, var(--secondary), #059669);
  color: white;
}

.btn-success:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(16, 185, 129, 0.3);
}

.btn-secondary {
  background: var(--glass-bg);
  border: 1px solid var(--card-border);
  color: var(--light);
}

.btn-secondary:hover {
  background: rgba(99, 102, 241, 0.1);
  border-color: var(--primary);
  transform: translateY(-2px);
}

.btn-badge {
  background: white;
  color: var(--primary);
  padding: 0.25rem 0.75rem;
  border-radius: 50px;
  font-size: 0.875rem;
  font-weight: 700;
  margin-left: 0.5rem;
}

.download-options {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.download-size {
  background: rgba(255, 255, 255, 0.2);
  padding: 0.25rem 0.75rem;
  border-radius: 50px;
  font-size: 0.875rem;
  margin-left: 0.5rem;
}

.download-formats {
  display: flex;
  gap: 0.75rem;
}

.download-formats select {
  flex: 1;
  background: var(--glass-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 0.75rem;
  color: var(--light);
  font-size: 0.875rem;
  cursor: pointer;
}

.btn-share {
  background: var(--glass-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 0.75rem 1.5rem;
  color: var(--light);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition);
}

.btn-share:hover {
  background: rgba(99, 102, 241, 0.1);
  border-color: var(--primary);
  transform: translateY(-2px);
}

.batch-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

/* ===== FEATURES SECTION ===== */
.features-section {
  margin: 6rem 0;
  padding: 4rem 0;
  border-top: 1px solid var(--card-border);
  border-bottom: 1px solid var(--card-border);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 3rem;
}

.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-xl);
  padding: 2rem;
  text-align: center;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-10px);
  border-color: var(--primary);
  box-shadow: var(--shadow-xl);
}

.feature-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  color: white;
  font-size: 1.5rem;
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.feature-card p {
  color: var(--gray);
  font-size: 0.875rem;
  line-height: 1.6;
}

/* ===== HOW IT WORKS ===== */
.how-it-works {
  margin: 4rem 0;
}

.steps-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  margin-top: 3rem;
  position: relative;
}

.step {
  flex: 1;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-xl);
  padding: 2rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  transition: var(--transition);
}

.step:hover {
  border-color: var(--primary);
  transform: translateY(-5px);
}

.step-number {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 700;
  flex-shrink: 0;
}

.step-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.step-content p {
  color: var(--gray);
  font-size: 0.875rem;
}

.step-arrow {
  color: var(--primary);
  font-size: 1.5rem;
  animation: bounce 2s infinite;
}

/* ===== FOOTER ===== */
.footer {
  margin-top: 6rem;
  padding-top: 4rem;
  border-top: 1px solid var(--card-border);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-section h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.footer-logo i {
  font-size: 2rem;
  color: var(--primary);
}

.footer-description {
  color: var(--gray);
  font-size: 0.875rem;
  line-height: 1.6;
}

.footer-section ul {
  list-style: none;
}

.footer-section ul li {
  margin-bottom: 0.75rem;
}

.footer-section ul li a {
  color: var(--gray);
  text-decoration: none;
  transition: var(--transition);
}

.footer-section ul li a:hover {
  color: var(--primary);
}

.format-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.format-badge {
  background: var(--glass-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
}

.social-links {
  display: flex;
  gap: 1rem;
}

.social-link {
  width: 40px;
  height: 40px;
  background: var(--glass-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  color: var(--gray);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  text-decoration: none;
}

.social-link:hover {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
  transform: translateY(-2px);
}

.footer-bottom {
  text-align: center;
  padding: 2rem 0;
  border-top: 1px solid var(--card-border);
  color: var(--gray);
  font-size: 0.875rem;
}

.footer-bottom i {
  color: var(--danger);
}

/* ===== TOAST NOTIFICATIONS ===== */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.toast {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  box-shadow: var(--shadow-xl);
  animation: slideInRight 0.3s ease-out;
  max-width: 300px;
}

.toast i {
  font-size: 1.25rem;
}

.toast.success i {
  color: var(--success);
}

.toast.error i {
  color: var(--danger);
}

.toast.info i {
  color: var(--info);
}

.toast-content {
  flex: 1;
}

.toast-message {
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.toast-description {
  font-size: 0.875rem;
  color: var(--gray);
}

/* ===== LOADING OVERLAY ===== */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(10px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.loading-overlay.active {
  display: flex;
  animation: fadeIn 0.3s ease-out;
}

.loading-content {
  text-align: center;
  max-width: 400px;
  padding: 2rem;
  background: var(--card-bg);
  border-radius: var(--radius-xl);
  border: 1px solid var(--card-border);
}

.loading-spinner {
  width: 60px;
  height: 60px;
  border: 4px solid var(--glass-bg);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 1.5rem;
}

.loading-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.loading-content p {
  color: var(--gray);
  margin-bottom: 1.5rem;
}

.loading-progress {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.progress-bar {
  flex: 1;
  height: 6px;
  background: var(--glass-bg);
  border-radius: 3px;
  overflow: hidden;
}

.progress-bar::after {
  content: '';
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  width: 0%;
  transition: width 0.3s ease;
}

.progress-text {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--primary);
  min-width: 40px;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 1200px) {
  .compression-grid {
    grid-template-columns: 1fr;
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-content {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .hero-section {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-stats {
    grid-template-columns: 1fr;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .steps-container {
    flex-direction: column;
    gap: 2rem;
  }
  
  .step-arrow {
    transform: rotate(90deg);
  }
  
  .nav-container {
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
  }
  
  .main-container {
    padding: 8rem 1rem 1rem;
  }
  
  .quality-presets,
  .format-options {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2.5rem;
  }
  
  .card-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
  
  .dimension-inputs {
    grid-template-columns: 1fr;
  }
  
  .batch-actions {
    grid-template-columns: 1fr;
  }
  
  .download-formats {
    flex-direction: column;
  }
}

/* ===== UTILITY CLASSES ===== */
.hidden {
  display: none !important;
}

.show {
  display: block !important;
}

.btn-clear {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.3);
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  transition: var(--transition);
}

.btn-clear:hover {
  background: rgba(239, 68, 68, 0.2);
}

.auto-optimize {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.toggle-switch {
  width: 40px;
  height: 20px;
  background: var(--gray);
  border-radius: 10px;
  position: relative;
  cursor: pointer;
  transition: var(--transition);
}

.toggle-switch::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  background: white;
  border-radius: 50%;
  top: 2px;
  left: 2px;
  transition: var(--transition);
}

input[type="checkbox"]:checked + label .toggle-switch {
  background: var(--secondary);
}

input[type="checkbox"]:checked + label .toggle-switch::after {
  transform: translateX(20px);
}

input[type="checkbox"] {
  display: none;
}

.toggle-switch-small {
  width: 32px;
  height: 16px;
  background: var(--gray);
  border-radius: 8px;
  position: relative;
  cursor: pointer;
  display: inline-block;
  transition: var(--transition);
}

.toggle-switch-small::after {
  content: '';
  position: absolute;
  width: 12px;
  height: 12px;
  background: white;
  border-radius: 50%;
  top: 2px;
  left: 2px;
  transition: var(--transition);
}

input[type="checkbox"]:checked + .toggle-switch-small {
  background: var(--secondary);
}

input[type="checkbox"]:checked + .toggle-switch-small::after {
  transform: translateX(16px);
}

.btn-toggle-advanced {
  background: none;
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray);
  cursor: pointer;
  transition: var(--transition);
}

.btn-toggle-advanced:hover {
  background: var(--glass-bg);
  border-color: var(--primary);
  color: var(--primary);
}